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36
Board Components and their Functions
Section 2-2
Note a) When interrupt inputs are used in interrupt input mode, the indica-
tor may not light even when the interrupt condition is met if the in-
put is not ON long enough. When a high-speed counter is being
used, the indicator may not light depending on the speed of the
pulses.
b) Input indicators will reflect the status of the corresponding inputs
even when the PLC is stopped, but the corresponding input bits
will not be refreshed.
6.
Output Indicators
The output indicators are lit when the corresponding output terminal is ON.
The indicators are lit during I/O refreshing. When an output is being used
as a pulse output, the corresponding will remain lit while pulses are being
output.
7.
Peripheral Port
Connects the PLC to a Programming Device (including Programming Con-
soles), host computer, or standard external device.
8.
RS-232C Port
Connects the PLC to a Programming Device (excluding Programming
Consoles), host computer, Programmable Terminal, or standard external
device.
9.
Communications Switches SW201 and SW202
The Communications Switches control the communications settings for the
peripheral port and RS-232C port.
Note a) The standard settings are 1 start bit, 7 data bits, 2 stop bits, even
parity, and 9,600 bps baud rate.
b) Be sure that Communications Switch SW201 is OFF when con-
necting a Programming Console.
10. Analog Settings
Turning these controls changes the contents of IR 250 and IR 251. The
contents of these words can be set independently between 0 and 200.
Switch settings Peripheral port communications
RS-232C port
communications
SW202 SW201
OFF
OFF
Programming Console connection
The settings in the PLC
Setup (DM 6645 to
DM 6649) are used.
OFF
ON
Other Programming Device:
The settings in the PLC Setup
(DM 6650 to DM 6654) are used.
ON
OFF
Programming Console connection
The standard settings
are used.
ON
ON
Other Programming Device:
The standard settings are used.
(OFF when shipped.)
(OFF when shipped.)
SW201
SW202
ON
ON
OFF
OFF
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